WO2010119640A1 - Système optique à objectif - Google Patents

Système optique à objectif Download PDF

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Publication number
WO2010119640A1
WO2010119640A1 PCT/JP2010/002514 JP2010002514W WO2010119640A1 WO 2010119640 A1 WO2010119640 A1 WO 2010119640A1 JP 2010002514 W JP2010002514 W JP 2010002514W WO 2010119640 A1 WO2010119640 A1 WO 2010119640A1
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WIPO (PCT)
Prior art keywords
group
optical system
lens
objective optical
positive
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PCT/JP2010/002514
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English (en)
Japanese (ja)
Inventor
高頭英泰
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オリンパスメディカルシステムズ株式会社
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Application filed by オリンパスメディカルシステムズ株式会社 filed Critical オリンパスメディカルシステムズ株式会社
Priority to CN201080024960.1A priority Critical patent/CN102460266B/zh
Priority to EP10764227.4A priority patent/EP2420880B1/fr
Priority to JP2010540978A priority patent/JP4819969B2/ja
Priority to US12/925,132 priority patent/US8203798B2/en
Publication of WO2010119640A1 publication Critical patent/WO2010119640A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2423—Optical details of the distal end
    • G02B23/243—Objectives for endoscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00188—Optical arrangements with focusing or zooming features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/105—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens with movable lens means specially adapted for focusing at close distances

Definitions

  • the present invention relates to an objective optical system, and more particularly, to an endoscope objective lens having a focusing function and capable of close observation, and a photographing lens such as a small consumer camera.
  • a conventional endoscope objective lens has no focusing function, but has a wide observation depth of approximately 5 to 100 mm on the object side.
  • An endoscope equipped with such an objective lens mainly provides an image using a solid-state imaging device such as a CCD.
  • a CCD solid-state imaging device
  • Such an objective lens for an endoscope is mainly intended to be used in the same manner as a general endoscope objective lens, so that it is desirable that there is not much change in appearance when focusing, and the viewing angle of view also changes. It is required not to.
  • Patent Documents 2 and 3 disclose the two-group configuration.
  • Patent Document 4 discloses a type that is composed of three negative, positive, and negative groups and in which the positive second group moves to perform focusing.
  • the endoscope objective lens described in Patent Document 1 or 2 is difficult to say with a wide angle and has a narrow field of view at the time of observation. Therefore, it becomes difficult to perform treatment such as treatment on the lesioned part, which causes practical problems.
  • the objective lens described in Patent Document 3 is unsatisfactory in terms of performance because of a large variation in image plane during focusing.
  • the optical systems described in Patent Documents 4 to 7 have a wide range of object points that can be focused and can be observed closer, so that the magnification at the time of closest observation is large, and it is suitable for performing magnified observation.
  • the angle of view changes greatly during focusing, and it is a wide angle during normal observation, which is a long-distance object point, but it becomes extremely narrow when close to the object, so it can be screened as a general endoscope objective lens, Difficult workability arises for the treatment of a lesion.
  • the present invention has been made in view of such problems of the prior art, and the object thereof is to enable focusing according to changes in the object point distance, and in that case, there is little change in the angle of view.
  • An object of the present invention is to provide a high-performance objective optical system corresponding to a pixel imaging device.
  • An object of the present invention is to provide an objective optical system that is capable of focusing on a change in object distance by moving at least one lens unit and satisfying the following conditional expression. It is a system.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • the second invention is composed of at least three groups, and at least one lens group among them can move to focus on a change in object distance, and satisfies the following conditional expression.
  • This is an objective optical system.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • the third invention is composed of at least three groups, and at least one lens group among them can move to focus on a change in the object distance, and satisfies the following conditional expression.
  • This is an objective optical system.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • the focusing lens may move any of a plurality of groups, and the movable group may be one group or a plurality of groups.
  • the mechanical structure can be simplified.
  • the half angle of view which is the visual field range, satisfies the following conditional expression as a minimum for a wide-angle visual field.
  • the angle of view does not change as much as possible during focusing. If the change in the angle of view exceeds 20%, the viewing angle changes remarkably during focusing, and it looks as if electrons are being magnified. Therefore, it is desirable that the ratio of the observation angle of view when focusing satisfies the following conditional expression.
  • conditional expression (2) should be limited as follows.
  • fn is the focal length of the entire system during close-up observation
  • ff is the focal length of the entire system during long-distance observation.
  • conditional expression (3) should be limited as follows.
  • the change in the angle of view is caused not only by the change of the focal length but also by the change of the distortion. Therefore, it is desirable to satisfy the following conditional expression.
  • DTLn is the distortion at the maximum image height during close-up observation
  • DTLf is the distortion at the maximum image height during long-distance observation.
  • conditional expression (9) If the lower limit of 0.8 of conditional expression (9) is exceeded, the field of view will be narrowed when focusing from a long distance object point to a short distance object point, and the upper limit of 1.2 of conditional expression (9) will be exceeded. Similarly, it is not preferable because the field of view is widened during focusing.
  • the focusing mechanism can be realized, but if only the two groups are configured, the image plane variation during focusing tends to increase. There is no problem if the object range that can be focused is narrow, but it is desirable that there are three or more groups in consideration of performing focusing in a certain range of object points.
  • the movable lens is in the second group counting from the object side. If the first group is a movable group, a fixed cover glass is required in front of the first group and on the same surface as the distal end of the endoscope scope. When the first group moves to the image side, the light beam height in the cover glass increases, leading to an increase in diameter.
  • the movable group needs to be a positive group so that the angle of view does not fluctuate during focusing.
  • the movable group is a negative group, the variation of the entrance pupil position is large, and the resulting change in the angle of view is not preferable.
  • the objective optical system in the present invention has a three-group configuration, a high-performance optical system that can sufficiently cope with a high-pixel imaging device can be realized.
  • the second group which is a movable group, is a positive lens group so that the variation of the image plane during focusing is small
  • the first group and the third group may have either positive or negative power.
  • the lens of the second group may be any shape as long as it is a positive lens.
  • a positive meniscus lens having a convex surface facing the object side is more desirable.
  • the first group is negative and the third group is positive, it can be optimal for suppressing image plane fluctuations during focusing.
  • the first group When the first group is composed of a plurality of lenses, it is desirable that the first group has at least a negative first lens and a positive second lens in order from the object side.
  • the third group since the power of each group is all positive, it is necessary to have a strong negative lens in the first group. For this reason, it is desirable that the negative power of the first lens is stronger than the positive power of the second lens as in the conditional expression (11).
  • fl1 is the focal length of the first lens
  • fl2 is the focal length of the second lens
  • f1 is the focal length of the first group
  • f2 is the focal length of the second group.
  • conditional expression (6) If the lower limit of -0.6 of conditional expression (6) is exceeded, the light height at the first lens will increase, leading to an increase in the lens diameter. If the upper limit of ⁇ 0.1 of conditional expression (6) is exceeded, the power of the second lens group becomes relatively weak, the occurrence of field curvature increases, and the occurrence of coma increases. Degraded image quality.
  • focal length of the first group should satisfy the following conditional expression.
  • f1 is the focal length of the first group
  • ff is the focal length of the entire system during long-distance observation.
  • conditional expression (8) If the lower limit of -1.2 of conditional expression (8) is exceeded, the power of the first lens group becomes weak and the amount of distortion generated on the first surface decreases, resulting in a smaller angle of view. It becomes difficult to satisfy 1). If the upper limit of ⁇ 0.6 of conditional expression (8) is exceeded, the error sensitivity of the first group with respect to the angle of view will increase. A wide-angle optical system as in the present invention is not preferable because it may cause vignetting in the manufacturing process.
  • a negative first lens having a concave surface facing the image side that is fixed at the most object side during focusing is arranged.
  • the first lens may be a plano-concave lens or a concave meniscus lens.
  • a plano-concave lens has an advantage that it is difficult to be scratched because there is no protrusion on the lens surface.
  • a concave meniscus lens is suitable for widening the angle, and in particular, it is easy to realize an objective lens with a wide field of view where ⁇ f exceeds 70 °.
  • the third group is a positive group, it is possible to reduce the overall length while ensuring the back focus. Moreover, in order to ensure performance in relation to the second group, it is desirable to satisfy the following conditional expression.
  • f2 is the focal length of the second group
  • f3 is the focal length of the third group.
  • conditional expression (4) If the lower limit of 0.3 of conditional expression (4) is exceeded, the power of the second lens unit becomes too strong and the image plane falls under. In addition, image plane variation due to focusing increases, which is not preferable. If the upper limit of 6 to conditional expression (4) is exceeded, the power of the second lens group becomes weak and the sensitivity of image plane focus movement during focusing becomes low, so the lens must be moved more than necessary. This is not preferable because the lens movement amount is desired to be as small as possible in order to reduce the load on mechanical members such as a drive mechanism.
  • conditional expression (4) should be limited as follows.
  • the lens configuration of the third group is preferably a positive lens configuration in which a biconvex lens, a positive lens, and a negative lens are bonded together in order from the object side.
  • a biconvex lens is disposed so that the ray height does not increase, and a cemented lens is disposed to correct axial chromatic aberration and lateral chromatic aberration in a well-balanced manner.
  • this configuration does not have to be the case, and for example, an arrangement in which a negative lens, a positive lens, and a negative lens are joined together is conceivable.
  • the height of the light beam is made sufficiently small in the second group, and the lens configuration focuses on only chromatic aberration correction in the third group.
  • f2 is the focal length of the second group
  • f3 is the focal length of the third group.
  • f1 is the focal length of the first group
  • f3 is the focal length of the third group.
  • Conditional expression (7) is for reducing the curvature of field and minimizing the fluctuation of the image plane during focusing. If the lower limit of ⁇ 2.4 of the conditional expression (7) is exceeded, the power of the first group becomes relatively small with respect to the third group, so that the image surface becomes overexposed. On the other hand, if the upper limit of -1.5 in conditional expression (7) is exceeded, the power of the first lens group will increase and the image surface will fall under, which is not preferable. For this reason, if the range of the conditional expression (7) is exceeded, even if the center is in focus, an image that is not in focus is formed at the periphery, resulting in image quality degradation.
  • the movement amount of the second group which is a movable group, satisfies the following conditional expression.
  • ⁇ d is the amount of lens movement of the movable group when focusing from a long-distance object point to a short-distance object point
  • ff is the focal length of the entire system during long-distance observation.
  • conditional expression (10) If the lower limit of 0.07 in conditional expression (10) is exceeded, the amount of movement becomes too small, the amount of movement with respect to a certain object point change is small, and the sensitivity of the image plane position due to an error in lens stop accuracy increases. End up. In particular, the focus is likely to shift at a short-distance object point with a shallow depth of focus. If the upper limit of 0.38 in conditional expression (10) is exceeded, the amount of movement increases, and the overall length of the entire lens system also increases, making it unsuitable for miniaturization.
  • an aperture stop is arranged before and after the second group.
  • this aperture stop is positioned in front of the third lens unit and fixed during focusing, the effect is great. If it is fixed at the time of focusing, the exit pupil position remains unchanged, and the angle of light incident on the image sensor is kept constant. Therefore, the optical system is not affected by shading during focusing.
  • the aperture stop is arranged at the above position, the F-number fluctuation can be reduced, and a certain depth of field can be maintained at any object point.
  • focusing can be performed according to changes in the object point distance, and there is almost no change in the angle of view.
  • FIG. 1 of the endoscope objective optical system of Example 8 of this invention It is an aberration curve figure in the normal observation state (a) and the close observation state (b) of Example 1. It is an aberration curve figure in the normal observation state (a) and the proximity observation state (b) of Example 2. It is an aberration curve figure in the normal observation state (a) and proximity observation state (b) of Example 3. It is an aberration curve figure in the normal observation state (a) and proximity observation state (b) of Example 4. It is an aberration curve figure in the normal observation state (a) and the proximity observation state (b) of Example 5. It is an aberration curve figure in the normal observation state (a) and proximity observation state (b) of Example 6. It is an aberration curve figure in the normal observation state (a) and proximity observation state (b) of Example 7. It is an aberration curve figure in the normal observation state (a) and proximity observation state (b) of Example 8.
  • FIG. 1 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 1 to be described later.
  • Table 2 shows the values of the fluctuation parameters in the normal observation state (a) and the proximity observation state (b).
  • the surface number of the optical surface counted from the object side is indicated by “No”
  • the radius of curvature is “r”
  • the surface interval or air interval is “d”
  • the refractive index of e-line Is indicated by “ne” and the Abbe number is indicated by “vd”.
  • the radius of curvature and the surface spacing are in mm.
  • the surface spacing or air spacing between 3 and 4,... Is indicated by d 1 , d 2 , d 3 is same as below.
  • FIG. 1 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system includes, in order from the object side, a first group G1 having a positive refractive power, a second group G2 having a positive refractive power, and a third group G3 having a positive refractive power.
  • the first group G1 includes, in order from the object side, a plano-concave negative lens, a positive meniscus lens having a concave surface facing the object side, a positive meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side. It is composed of a bonded negative cemented lens.
  • the second group G2 is composed of one plano-convex positive lens, and has a focusing action by moving on the optical axis.
  • An aperture stop S is disposed between the first group G1 and the second group G2, and is fixed behind the first group G1 during focusing.
  • the third group G3 includes, in order from the object side, a negative meniscus lens having a concave surface facing the object side, and a positive cemented lens in which a biconvex positive lens and a negative meniscus lens having a convex surface facing the image surface are bonded. ing.
  • a plane parallel plate F1 is disposed behind the third group G3.
  • the plane parallel plate F1 is a filter for cutting a specific wavelength, for example, light of 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and satisfies the other conditions (1) to (11) except for (5) to (8).
  • a compact imaging optical system can be configured without image quality deterioration.
  • 9A and 9B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • Fno is the F number
  • IH is the maximum image height (mm).
  • the solid line in the astigmatism diagram is the sagittal image plane, and the broken line is the meridional image plane.
  • the horizontal axis represents the amount of aberration (mm).
  • “E-003” means “ ⁇ 10 ⁇ 3 ”.
  • the horizontal axis of the distortion aberration is the aberration amount (%).
  • the unit of the wavelength (legend) of the aberration curve is nm. same as below.
  • FIG. 2 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 3 to be described later.
  • Table 4 shows the values of the fluctuation parameters in the normal observation state (a) and the proximity observation state (b).
  • FIG. 2 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system includes, in order from the object side, a first group G1 having a positive refractive power, a second group G2 having a positive refractive power, and a third group G3 having a positive refractive power.
  • the first group G1 includes, in order from the object side, a plano-concave negative lens, a positive meniscus lens having a concave surface facing the object side, a biconvex positive lens, and a negative meniscus lens having a convex surface facing the object side.
  • the second group G2 is composed of a single positive meniscus lens having a concave surface directed toward the object side, and has a focusing action by moving on the optical axis.
  • An aperture stop S is disposed between the first group G1 and the second group G2, and is fixed behind the first group G1 during focusing.
  • the third group G3 includes, in order from the object side, a positive three-lens cemented lens in which a negative meniscus lens having a convex surface facing the object side, a biconvex positive lens, and a negative meniscus lens having a concave surface facing the object side are bonded together.
  • a plane parallel plate F1 is disposed behind the third group G3.
  • the plane parallel plate F1 is a filter for cutting a specific wavelength, for example, light of 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and satisfies other conditions (1) to (11) except for (5) to (8).
  • the focal length of each group from the first group G1 to the third group G3 is set to an appropriate value, a compact imaging optical system can be configured without image quality deterioration.
  • FIGS. 10A and 10B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • FIG. 3 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 5 to be described later.
  • Table 6 shows the values of the fluctuation parameters in the two states of the normal observation state (a) and the close-up observation state (b).
  • FIG. 3 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system according to the present embodiment includes, in order from the object side, a first group G1 having a positive refractive power, a second group G2 having a positive refractive power, and a third group G3 having a negative refractive power. Yes.
  • the first group G1 includes, in order from the object side, a plano-concave negative lens, a positive cemented lens in which a biconvex positive lens and a negative meniscus lens having a concave surface facing the object side are bonded together, and a negative meniscus having a concave surface facing the object side
  • the lens is composed of a negative meniscus lens having a convex surface facing the object side.
  • the second group G2 is composed of one biconvex positive lens, and has a focusing action by moving on the optical axis.
  • An aperture stop S is disposed between the first group G1 and the second group G2, and is fixed behind the first group G1 during focusing.
  • the third group G3 includes, in order from the object side, a positive cemented lens in which a biconcave negative lens and a biconvex positive lens are bonded together, and a negative meniscus lens having a convex surface directed to the image surface side.
  • Parallel plane plates F1 and F2 are arranged behind the plano-concave negative lens of the first group G1 and behind the third group G3.
  • the plane parallel plates F1 and F2 are filters for cutting a specific wavelength, for example, 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or light in the near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system according to the present embodiment is configured as described above, and satisfies other conditions (1) to (11) except for (4) and (6) to (8).
  • FIGS. 11A and 11B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • FIG. 4 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 7 to be described later.
  • Table 8 shows the values of the fluctuation parameters in the two states of the normal observation state (a) and the close-up observation state (b).
  • FIG. 4 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system according to the present embodiment includes, in order from the object side, a first group G1 having a negative refractive power, a second group G2 having a positive refractive power, and a third group G3 having a negative refractive power.
  • the first group G1 in order from the object side, is a positive junction in which a plano-concave negative lens, a negative meniscus lens having a convex surface facing the object side, and a biconvex positive lens and a negative meniscus lens having a concave surface facing the object side are bonded together.
  • the lens is composed of a negative meniscus lens having a convex surface facing the object side.
  • the second group G2 is composed of one biconvex positive lens, and has a focusing action by moving on the optical axis.
  • the third group G3 includes, in order from the object side, a negative meniscus lens having a convex surface facing the image surface side, and a positive cemented lens in which a biconvex positive lens and a biconcave negative lens are bonded.
  • An aperture stop S is disposed between the second group G2 and the third group G2, and moves together with the second group G2 during focusing.
  • Parallel plane plates F1 and F2 are arranged behind the negative meniscus lens having a convex surface facing the object side of the first group G1 and behind the third group G3.
  • the plane parallel plates F1 and F2 are filters for cutting a specific wavelength, for example, 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or light in the near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and excludes (4), (7), (8), (10), and (11) among the conditional expressions (1) to (11). Others meet. Further, by setting the focal length of each group from the first group G1 to the third group G3 to an appropriate value, it is possible to configure a compact imaging optical system without image quality deterioration.
  • FIGS. 12A and 12B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • FIG. 5 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 9 to be described later.
  • Table 10 shows the values of the fluctuation parameters in the two states of the normal observation state (a) and the close-up observation state (b).
  • FIG. 5 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system includes, in order from the object side, a first group G1 having a negative refractive power, a second group G2 having a positive refractive power, and a third group G3 having a positive refractive power.
  • the first group G1 includes, in order from the object side, a negative cemented lens in which a plano-concave negative lens, a biconvex positive lens, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side are bonded together.
  • the second group G2 is composed of one positive meniscus lens having a convex surface facing the object side, and has a focusing action by moving on the optical axis.
  • the third group G3 includes, in order from the object side, a positive meniscus lens having a convex surface directed toward the object side, and a positive cemented lens in which a biconvex positive lens and a biconcave negative lens are bonded together.
  • An aperture stop S is disposed between the second group G2 and the third group G3, and moves together with the second group G2 during focusing.
  • Parallel plane plates F1 and F2 are arranged behind the plano-concave negative lens of the first group G1 and behind the third group G3.
  • the plane parallel plates F1 and F2 are filters for cutting a specific wavelength, for example, 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or light in the near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and satisfies the condition except that (5) in the conditional expressions (1) to (11) is omitted. Further, by setting the focal length of each group from the first group G1 to the third group G3 to an appropriate value, it is possible to configure a compact imaging optical system without image quality deterioration.
  • FIGS. 13A and 13B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • FIG. 6 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 11 to be described later.
  • Table 12 shows the values of the fluctuation parameters in the two states of the normal observation state (a) and the close-up observation state (b).
  • FIG. 6 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system according to the present embodiment includes, in order from the object side, a first group G1 having a negative refractive power, a second group G2 having a positive refractive power, and a third group G3 having a positive refractive power. Yes.
  • the first group G1 includes one negative meniscus lens having a convex surface facing the object side.
  • the second group G2 is composed of one positive meniscus lens having a convex surface facing the object side, and has a focusing action by moving on the optical axis.
  • the third group G3 includes, in order from the object side, a positive cemented lens in which a biconvex positive lens, a biconvex positive lens, and a negative meniscus lens having a convex surface facing the image surface are bonded together.
  • An aperture stop S is disposed between the second group G2 and the third group G3, and is fixed in front of the third group G3 during focusing.
  • Parallel plane plates F1 and F2 are disposed behind the first group G1 and the third group G3.
  • the plane parallel plates F1 and F2 are filters for cutting a specific wavelength, for example, 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or light in the near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and satisfies other conditions (1) to (11) except for (5) and (11). Further, by setting the focal length of each group from the first group G1 to the third group G3 to an appropriate value, it is possible to configure a compact imaging optical system without image quality deterioration.
  • FIGS. 14A and 14B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • FIG. 7 shows a sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment.
  • the lens data of this example is shown in Table 13 to be described later.
  • Table 14 shows the values of the fluctuation parameters in the two states of the normal observation state (a) and the close-up observation state (b).
  • FIG. 7 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system according to the present embodiment includes, in order from the object side, a first group G1 having a negative refractive power, a second group G2 having a positive refractive power, and a third group G3 having a positive refractive power. Yes.
  • the first group G1 is composed of one plano-concave negative lens.
  • the second group G2 is composed of a single positive meniscus lens having a convex surface facing the object side, and has a focusing action by moving on the optical axis.
  • the third group G3 includes, in order from the object side, a positive cemented lens in which a biconvex positive lens, a biconvex positive lens, and a negative meniscus lens having a convex surface facing the image surface are bonded together.
  • An aperture stop S is disposed between the second group G2 and the third group G3, and is fixed in front of the third group G3 during focusing.
  • Parallel plane plates F1 and F2 are disposed behind the first group G1 and the third group G3.
  • the plane parallel plates F1 and F2 are filters for cutting a specific wavelength, for example, 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or light in the near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and satisfies other conditions (1) to (11) except for (5) and (11). Further, by setting the focal length of each group from the first group G1 to the third group G3 to an appropriate value, it is possible to configure a compact imaging optical system without image quality deterioration.
  • FIGS. 15A and 15B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • FIG. 8 shows a cross-sectional view through the optical axis showing the configuration of the endoscope objective optical system of the present embodiment. Further, lens data of this example is shown in Table 15 to be described later. Table 16 shows the values of the fluctuation parameters in the two states of the normal observation state (a) and the close-up observation state (b).
  • FIG. 8 shows a configuration in two states, a normal observation state (a) and a proximity observation state (b).
  • the endoscope objective optical system according to the present embodiment includes, in order from the object side, a first group G1 having a negative refractive power, a second group G2 having a positive refractive power, and a third group G3 having a positive refractive power. Yes.
  • the first group G1 is composed of one plano-concave negative lens.
  • the second group G2 is composed of one positive meniscus lens having a convex surface facing the object side, and has a focusing action by moving on the optical axis.
  • the third group G3 includes, in order from the object side, a positive cemented lens in which a biconvex positive lens, a biconvex positive lens, and a negative meniscus lens having a convex surface facing the image surface are bonded together.
  • An aperture stop S is disposed between the second group G2 and the third group G3, and is fixed in front of the third group G3 during focusing.
  • Parallel plane plates F1 and F2 are disposed behind the first group G1 and the third group G3.
  • the plane parallel plates F1 and F2 are filters for cutting a specific wavelength, for example, 1060 nm of a YAG laser, 810 nm of a semiconductor laser, or light in the near infrared region.
  • An imaging element is disposed in the vicinity of the image plane I of the endoscope objective optical system, and constitutes an imaging optical system in combination with the above endoscope objective optical system.
  • a cover glass G for protecting the imaging surface is attached to the imaging element.
  • the seventh group and the third group G3 have a common lens configuration, and the focal length is changed by switching the two lenses of the first group G1 and the second group G2, and the viewing angle is changed. Wide angle.
  • the above-described image pickup device with high pixels is adopted as the image pickup device, a high-definition image can be obtained at each object point.
  • the imaging optical system of the present embodiment is configured as described above, and satisfies other conditions (1) to (11) except for (5) and (11). Further, by setting the focal length of each group from the first group G1 to the third group G3 to an appropriate value, it is possible to configure a compact imaging optical system without image quality deterioration.
  • FIGS. 16A and 16B show aberration curve diagrams in the normal observation state and the close-up observation state, respectively.
  • Tables 1 to 16 below show the numerical data and parameters of Examples 1 to 8 above.
  • the focal length is FD (mm)
  • the object point distance is OD (mm)
  • the F number is FNo
  • the maximum image height is IH (mm)
  • the normal observation state is FP
  • the nearest observation state is NP It shows with.
  • Table 17 shows numerical values of conditional expressions (1) to (11) in the configuration of each example.
  • Table 17 Conditional expression Example 1 2 3 4 5 6 7 8 (1) -1 67.8 68.1 72.9 62.6 64.4 80.4 67.3 80.8 (1) -2 64.7 65.8 69.3 65.8 65.9 77.0 65.9 74.6 (2) 0.95 0.97 0.95 1.05 1.02 0.96 0.98 0.92 (3) 1.02 1.01 0.99 0.94 0.94 0.97 0.97 0.94 (4) 0.36 0.84 -0.16 -0.05 1.18 3.66 2.08 2.00 (5) 0.36 0.84 -0.16 -0.05 1.18 3.66 2.08 2.00 (6) 5.80 0.66 5.21 -0.47 -0.47 -0.14 -0.25 -0.25 (7) 0.48 1.80 -1.18 40.02 -1.81 -1.99 -1.93 -2.02 (8) 16.02 3.08 10.08 -0.45 -0.98 -0.76 -0.87 -0.86 (9) 0.84 0.88 0.88 1.11 1.
  • the objective optical system of the present invention can be configured as follows, for example.
  • An objective optical system characterized in that focusing on a change in object distance can be performed by moving at least one lens unit, and the following conditional expression is satisfied.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • Objective optical system comprising at least three groups, and at least one of the lens groups can be moved to focus on changes in object distance, and satisfies the following conditional expression: system.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • An objective optical system comprising at least three groups, and at least one of the lens groups can be moved to focus on a change in object distance, and satisfies the following conditional expression: system.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • fn is the focal length of the entire system during close-up observation
  • ff is the focal length of the entire system during long-distance observation.
  • the objective optical system according to any one of 1 to 5, wherein the objective optical system includes a positive first group, a positive second group, and a positive third group in order from the object side.
  • the objective optical system as described in any one of 1 to 5 above which is composed of a positive first group, a positive second group, and a negative third group in order from the object side.
  • the objective optical system according to any one of 1 to 5, wherein the objective optical system includes a negative first group, a positive second group, and a positive third group in order from the object side.
  • the objective optical system according to any one of 1 to 5, wherein the objective optical system includes a negative first group, a positive second group, and a negative third group in order from the object side.
  • the first group consists of a negative first group, a positive second group, and a positive third group.
  • An objective optical system which performs focusing by moving from the object side to the image side and satisfies the following conditional expression.
  • fn is the focal length of the entire system during close-up observation
  • ff is the focal length of the entire system during long-distance observation.
  • f2 is the focal length of the second group
  • f3 is the focal length of the third group.
  • f2 is the focal length of the second group
  • f3 is the focal length of the third group.
  • f1 is the focal length of the first group
  • f2 is the focal length of the second group.
  • f1 is the focal length of the first group
  • f3 is the focal length of the third group.
  • the second group is composed of a positive meniscus lens having a convex surface facing the object side. 18.
  • the third group includes, in order from the object side, a biconvex lens, and a positive lens in which a positive lens and a negative lens are bonded to each other. 1 to 6, 8, 10 to 12, 14 The objective optical system according to any one of items 18 to 18.
  • f1 is the focal length of the first group
  • ff is the focal length of the entire system during long-distance observation.
  • fn is the focal length of the entire system during close-up observation
  • ff is the focal length of the entire system during long-distance observation.
  • DTLn is the distortion at the maximum image height during close-up observation
  • DTLf is the distortion at the maximum image height during long-distance observation.
  • ⁇ f is the maximum half angle of view (°) during long-distance object observation
  • ⁇ n is the maximum half angle of view (°) during close-up observation.
  • ⁇ f is the maximum half field angle (°) at the time of far-distance object observation
  • ⁇ n is the maximum half field angle at the time of close observation.
  • ⁇ f is the maximum half field angle (°) at the time of far-distance object observation
  • ⁇ n is the maximum half field angle at the time of close observation.
  • ⁇ d is the amount of lens movement of the movable group when focusing from a long-distance object point to a short-distance object point
  • ff is the focal length of the entire system during long-distance observation.
  • the present invention it is possible to provide a high-performance objective lens compatible with a high-pixel imaging device that can be focused according to a change in the object distance and hardly changes in the angle of view.
  • G1 ... 1st group G2 ... 2nd group G3 ... 3rd group S ... Brightness diaphragms F1, F2 ... Parallel plane plate G ... Cover glass I ... Image plane

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Abstract

L'invention porte sur un système optique à objectif haute performance adaptable à des éléments de capture d'image avec un grand nombre de pixels, lequel système permet la focalisation en fonction de la variation de la distance de point d'objectif et provoque moins de variation de l'angle de champ lorsqu'une telle focalisation est effectuée. Le système optique à objectif est configuré à partir d'au moins trois groupes (G1, G2, G3). Etant donné qu'au moins un groupe de lentilles (G2) parmi les groupes se déplace, la focalisation en fonction de la variation de distance de point d'objectif est possible. Les expressions conditionnelles suivantes sont satisfaites. ωf > 60...(1)-1 ωn > 60...(1)-2 0,8 < ωn/ωf <1,2...(2) où ωf est le demi-angle de champ maximal (°) dans le cas d'une observation de point d'objectif de distance éloignée, et ωn est le demi-angle de champ maximal (°) dans le cas d'une observation de point d'objectif de distance proche.
PCT/JP2010/002514 2009-04-16 2010-04-06 Système optique à objectif WO2010119640A1 (fr)

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JP2010540978A JP4819969B2 (ja) 2009-04-16 2010-04-06 対物光学系
US12/925,132 US8203798B2 (en) 2009-04-16 2010-10-13 Objective optical system

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JPWO2010119640A1 (ja) 2012-10-22
JP4819969B2 (ja) 2011-11-24
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CN102460266A (zh) 2012-05-16
US8203798B2 (en) 2012-06-19

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